Caught in the Storm tells the story of a deadly EF5 tornado in Joplin, Missouri, and here's why storms are classified this ...

It's one of the nation's most infamous tornado outbreaks, but it also spurred sorely needed improvements in both severe ...

"It’s likely that several of these tornadoes would have been rated F5 using the legacy Fujita scale." Thus, the lack of EF5-rated tornadoes in the past decade is "less due to a weakening of ...

Tornado classifications have evolved since the original Fujita (F scale) was developed in 1971. Under the original F scale, an F5 rating was given as follows: “Whole frame houses tossed off ...

The scale ranked these tornadoes from F0 (weakest) to F5 (strongest). The exact rank is determined by meteorologists and engineers after conducting surveys of damage from a particular storm.

The most powerful and deadliest tornado ever to hit the state of Iowa occurred around the Charles City area on May 15, 1968.

The original Fujita scale, developed in the 1970s ... researchers calculated the probability of at least one F5/EF5 tornado occurring in any given year to be 41%, with the chance of 10 consecutive ...